Sound locating apparatus



April 4, 1933. J; c N 1,903,294

SOUND LOCATING APPARATUS Filed Nov. 2, 1931 v n IVII/11111111101111 n..--.

INVENTOR. Llamas llKa r'nes A TTORNEY' Patented Apr. 4, 1933 JAMES C. KARNES, OF BUFFALO, NEW YORK SOUND LOGA'I ING APPARATUS Application filed November 2,1931. Serial No. 572,543.

(GRANTED UNDER THE ACT OF MARCH 3, 1883, AS AMENDED APRIL 30, 1928; 370 O. G. 757) The invent-ion described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a sound locating apparatus of the type operating according to a system of binaural comparison in which the apertures are directed at the source of sound and the listener reduces the phase difference to zero.

The apparatus forming the subject of the present invention is an improvement over that disclosed in Patent No. 1,774,826 of September 2, 1930, and in which a pair of vertically disposed horns and apair of horizontally disposed horns are positioned on intersecting base lines equidistant from the point of intersection of the base lines. As the horns are extremely large, the arrangement of the patent necessitates a supporting mount of a size that is inconvenient for service in the field.

The principal object of the present invention is to provide a grouping of the horns that will permit a considerable reduction in size of the supporting mount.

To these and other ends, the invention consists in the construction, arrangement and combination of elements described hereinafter and pointed out in the claims forming a part of this specification.

A practical embodiment of the invention is illustrated in the accompanying drawing, wherein:

Fig. 1 is a view in front elevation, parts in section, showing the improved apparatus pointed at zero elevation.

Fig. 2 is a side elevational View taken on the line 2-2 of Fig. 1.

Fig. 3 is a detail sectional View on the line 3--3 of Fig. 1.

Fig. 4 is a detail View of the elevating mechanism.

Fig. 5 is a fragmentary View of a portion of a modified form of horn support. A

Fig. 6 is a sectional view of another modification of the horn support.

Referring to Figs. 1 to 4 the apparatus comprises a mount in which a base 5 rotatably supports a top carriage 6 including spaced standards 77. The traversing mechanism for moving the top carriage in azimuth consists of a shaft 8 mounted in the top carriage and having a gear 9 meshing with a ring gear 10 on the base. I The spaced standards 77 each terminate in a bearing 11 adapted toreceive a hori-* zont'ally disposed support 12 which is confined by trunnion caps 13.13. A segmental gear 14 fast on the support 12 is actuated by worm gearing 15 carried by one of the standards andprovides the means wherebythe support is rotated about its axis.

An arm 16 is fast on the center of the support 12, either integrally as in Fig. 1 or detachably as in Fig. 5, and is positioned perpendicular thereto at a point'midway between the standards. 7

A pair of horns AA arranged in parallel relation are carried on the extremities ofthe support 12 and directly adjacent thereto on the side opposite to the arm 16. A third horn B similarly carried by the central, portion of the support 12 between the standards and in the line. with the horns AA, is paired with a horn B on the extremity of the arm-16. The three horns in line on the support 12 are arranged to counter-balance the arm 16 and the remote horn B carried thereby. The distances between the horns of each group are preferably the same.

The horns A are each provided with a flexible sound conducting tube a leading to the head set 17 of the azimuth listener, while similar tubes 7) on the horns B lead to the head set 18 of the elevation listener.- The support 12 and arm 16 are preferably hollow so that they may be utilized to house the tubes a and b, or to replace a portion thereof as shown in Fig. 6. 7

Referring especially to Fig. 1, the horns A and B are of the type shown in Patent No.

1,7 58,393 of May 13, 1930, in which increased directivity is obtained by providing an eccentric throat and parallel sides 1919 for each set of horns. This accounts for the apparent out of line position (Fig. 2) of the lower horn B with respect to the horns A.

I claim. 1. In a sound apparatus, a mount ineluding spaced standards, a horizontal support trunnioned' in the standards andinclud- I I ing a perpendicular arm atits center, a horn I I on each end of the support outside the stand- 5 ards and on the side of the support opposite I I I I I I I to the arm, a horn on the support in line 'Wltll the end horns and positioned between I I I I I I I I I I I I I I thestandards, andahorn ontheendof the, I,

arm, said arm and horn counterbalancing the I I I I I I I I I I remaining horns.

2. Inasound apparatus,amountineluding, c, spaced'standards,ahorizontal support trun- I i 7 i 7 7 7 nioned in the standards and including a perpendicular arm at its center, ahornoneach I I I I c I I c I I I I I I I I I I I I I I I end of the support outside the standards and on the side of the support opposite to the arm, a horn on the support'in line With'the end g I I I I I I I horns and positioned between the standards, I I II I I I I I I I I I I I I I I I I I and a horn on theend of the arm 29 3. In a sound apparatus, a mount, a support trunnioned on the mount, a plurality of I I I I I I I I I I I horns carried 'by'the support adjacent its I I I I I I I I I I I I I I I I I trunnioned axis, and a single horn carried by the supportremote from its trunnioned I I I I I I I axis and counterbalancing the plurality ot' I horns.

4:. In a sound apparatus, a mount, a crossarm support trunnioned on the mount, a pair of horizontally spaced horns carried by the support, a 'pair'ofvertical'ly spaced horns I I I I I I I I I I I I I I I carried by the support, one of thevertical I I 'pairbeing substantially in linewiththe hori I I I I I I I I I I I zontal pair.

5. In a sound apparatus, amount, a cross- 36 arm support trunnioned 0n.themount,ahorn I I I I I I I I I at the extremity of each arm of the support, andsaid support carrying three horns in sub stantial horizontal alignment.

6 In a sound apparatus, a hollowsupport, a rigid horn on each end of the support, and a flexible tube on each horn housed in the hollow support.

JAMES C. KARNES. 

